US Bridges

Signal Butte Road over Adot Channel

Good

Maricopa County, Arizona · Signal Butte & SR-24 · Structure no. 07368

Built
2022
3 years old
Condition
Good
inspected September 2022
Type
Culvert
Concrete Continuous
Length
28 ft
3 main spans
Daily traffic
2,000
2022 count
Owner
State
State Highway Agency

About this bridge

Signal Butte Road over Adot Channel is a concrete continuous culvert carrying Signal Butte Road over Adot Channel in Maricopa County, Arizona. It was built in 2022, so it is 3 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,000 vehicles a day, roughly 2% of them trucks, projected to reach 2,010 by 2042. The structure is 28 ft (8.5 m) long and 229 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSignal Butte Road
CrossesAdot Channel
LocationSignal Butte & SR-24
RouteState Highway 24
CountyMaricopa County
StateArizona
Coordinates33.3001, -111.6005
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length28 ft (8.5 m)
Longest span8 ft (2.4 m)
Deck width229 ft (69.8 m)
Roadway width227 ft (69.2 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic2,000 (2022)
Projected traffic2,010 by 2042
Trucks2%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Signal Butte Road over Adot Channel built?

It was built in 2022, making it 3 years old in 2025.

What condition is Signal Butte Road over Adot Channel in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2022.

How much traffic does Signal Butte Road over Adot Channel carry?

About 2,000 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Signal Butte Road over Adot Channel?

The structure is 28 ft (8.5 m) long with a longest span of 8 ft (2.4 m) and a deck 229 ft wide.

Who owns Signal Butte Road over Adot Channel?

It is owned by the State Highway Agency.